DSpace
 
  Repositório Institucional da Universidade de Aveiro > Departamento de Química > DQ - Artigos >
 Preparation and evaluation of the barrier properties of cellophane membranes modified with fatty acids
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5232

title: Preparation and evaluation of the barrier properties of cellophane membranes modified with fatty acids
authors: Tomé, Liliana C.
Gonçalves, Carla M. B.
Boaventura, Marta
Brandão, Lúcia
Mendes, Adélio M.
Silvestre, Armando J. D.
Neto, Carlos Pascoal
Gandini, Alessandro
Freire, Carmen S. R.
Marrucho, Isabel M.
keywords: Cellophane membranes
Esterification
Fatty acids
Water vapor permeation
Gas permeation
issue date: 2011
publisher: Elsevier
abstract: Cellophane (regenerated cellulose) membranes with tailored properties regarding hydrophobic character and barrier effects were prepared by their controlled heterogeneous esterification with two fatty acid derivatives (hexanoyl and dodecanoyl chlorides) The characterization of the modified membranes was performed by FUR spectroscopy X-ray diffraction and thermogravimetry confirming the success of the heterogeneous modification reaction while keeping cellophane membranes structural properties Contact angle measurements clearly confirm the enhanced hydrophobic character displayed by the modified cellophane membranes The evaluation of their barrier properties was carried out by determining the permeability towards water vapor at different relative humidities and the permeability towards nitrogen oxygen and carbon dioxide using the time-lag method in both wet and dry states A decrease in both the water permeation and the permeability towards these gases in the wet state was observed for the modified membranes No significant differences in behavior were found between the membranes prepared with hexanoyl and dodecanoyl chloride regarding hydrophobicity but the different lengths of the chain allowed a fine tune of the permeability The obtained cellophane membranes are a good example of the development of new bio-based materials with improved surface and barrier properties (C) 2010 Elsevier Ltd All rights reserved
URI: http://hdl.handle.net/10773/5232
ISSN: 0144-8617
publisher version/DOI: http://dx.doi.org/10.1016/j.carbpol.2010.08.060
source: Carbohydrate Polymers
appears in collectionsDQ - Artigos

files in this item

file description sizeformat
science.pdf516.23 kBAdobe PDFview/open
Restrict Access. You can Request a copy!
statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! RCAAP OpenAIRE DeGóis
ria-repositorio@ua.pt - Copyright ©   Universidade de Aveiro - RIA Statistics - Powered by MIT's DSpace software, Version 1.6.2